We hadn't when we tripped over an article in the New York Times titled A new scientific field is recasting who we are and how we got that way by Dalton Conly of Princeton University. It highlights scientific progress in genetics by answering some questions such as: “how do our genes predetermine our health, or our success in life.” The article in questions is an interesting case study in wokeness as well, but we won’t go into that.
In this
post, we’ll try (1) to recast the new scientific context, now dubbed sociogenomics,
a fusion of behavioural science and genomics, and (2) list a few important
results. Here we go:
Throughout human history, genetics (“blood”,
or “family line” in ancient parlance), was held to determine the future of our
offspring. Ch. Darwin and G. Mendel made important contributions (Darwin, in
this blog’s opinion, was the pivotal killer of “faith-based” believe systems
(religions)). Then, F. Crick and J. Watson decoded the workings of the DNA—explaining
how “sex” works
in creating inherited traits, and we got used to the idea that specific
traits are connected to specific genes.
But then came the discovery that some traits are not linked to one gene, but correlated to a whole profile of genes, which led to the construction of so-called polygenetic indexes. Initially, research focused on the genetic profiles (PGI-scores) of specific diseases--63% of breast cancer incidence can now be linked to polygenetic factors, or 71% of schizophrenia. But then it became clear that all kinds of things human are related to all kinds of polygenetic factors.
Take educational attainment: among adults who score very low on the corresponding PGI, only 7% finish college. Among those whose score is very hight, the number is 71%. PGI’s have been created for more than 3500 traits, from sleep habits to right- or left-handedness and extroversion.
But that’s not all. PGI’s codetermine social behaviour. Children who have genes that correlate to more success in school evoke more intellectual engagement from their parents than kids in the same family who don’t share these genes. This feedback loop starts at the age of 18 month, long before any assessment of academic ability. In other words, parents don’t just parent their children, children parent their parents, somehow---somewhat mysteriously---guided buy their genes. And it turns out that genetic guidance happens everywhere. People in the US tend to marry people with similar genetic profiles. Very similar, in fact: spouses are on average the genetic equivalents of their first cousins once removed. Even more mysteriously, there’s the effect of lateral gene transfer (something very popular among microbes): your spouse's genes influence your likelihood of depressions almost a third as much as your own genes do. The presence of a few genetically predisposed smokers in high school appears to cause smoking rates to spike for an entire grade---even among those students who didn’t personally know those nicotine-prone classmates---spreading like a genetically sparked wildfire through the social network.
Polygenetic indexes have spread
rapidly and are now arriving in IVF-clinics. In the past, one could already
screen embryos for some genetic diseases, but soon you will be able to screen
them for happiness and success in life. It’s a brave new world out there. Be
prepared.